Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Que campeonato foi jogado com Allan Stone como parceiro?
 ###Tabelas: CREATE TABLE head_quarters_and_support_regiments (head_quarters_and_support_regiments_id AUTO_INCREMENT PRIMARY KEY, Unit VARCHAR, Complement VARCHAR, Killed VARCHAR, Wounded VARCHAR, Missing VARCHAR) CREATE TABLE opinion_polls (opinion_polls_id AUTO_INCREMENT PRIMARY KEY, Source VARCHAR, Date VARCHAR, Kaine (D) VARCHAR, Kilgore (R) VARCHAR, Potts (I) VARCHAR) CREATE TABLE mixed_doubles:_13_4_titles_9_runner-ups (mixed_doubles:_13_4_titles_9_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE performance_and_ranking_timeline (performance_and_ranking_timeline_id AUTO_INCREMENT PRIMARY KEY, 2004/ 05 VARCHAR, 2005/ 06 VARCHAR, 2007/ 08 VARCHAR, 2008/ 09 VARCHAR, 2009/ 10 VARCHAR, 2010/ 11 VARCHAR, 2011/ 12 VARCHAR) CREATE TABLE appearances__&__goals (appearances__&__goals_id AUTO_INCREMENT PRIMARY KEY, Squad No. INT, Name VARCHAR, Position VARCHAR, League Apps VARCHAR, League Goals INT, FA Cup Apps VARCHAR, FA Cup Goals INT, League Cup Apps VARCHAR, League Cup Goals INT, FLT Apps VARCHAR, FLT Goals INT, Total Apps VARCHAR, Total Goals INT)  
SELECT Championship FROM mixed_doubles:_13_4_titles_9_runner-ups WHERE Partner = Allan Stone